> For the complete documentation index, see [llms.txt](https://docs.o3.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.o3.app/guides/manage-your-crypto-assets/what-is-data.md).

# What is Data？

O3 cross-chain wallet allows users to record custom data which will be stored permanently on the blockchain.

### Steps: 

1. Select the asset you want to transfer on the wallet homepage;
2. Click \[Send];
3. Selec \[Advanced] at the bottom of the transfer page;
4. Click \[Plain] and enter the custom data page;
5. Enter the information you would like to be permanently stored on the block chain, such as "O3".